A building casts a shadow of 10 meters when the angle of elevation of the sun is

Practice Questions

Q1
A building casts a shadow of 10 meters when the angle of elevation of the sun is 45 degrees. What is the height of the building?
  1. 10 meters
  2. 15 meters
  3. 20 meters
  4. 25 meters

Questions & Step-by-Step Solutions

A building casts a shadow of 10 meters when the angle of elevation of the sun is 45 degrees. What is the height of the building?
Correct Answer: 10 meters
  • Step 1: Understand that the angle of elevation is the angle between the ground and the line from the top of the building to the sun.
  • Step 2: Recognize that when the angle of elevation is 45 degrees, the height of the building and the length of the shadow are equal.
  • Step 3: Use the tangent function, which relates the height of the building to the length of the shadow: tan(angle) = height / shadow.
  • Step 4: Since the angle is 45 degrees, we know that tan(45) = 1.
  • Step 5: Substitute the values into the formula: height = shadow * tan(45).
  • Step 6: Calculate the height: height = 10 meters * 1 = 10 meters.
  • Trigonometry – The problem involves using the tangent function to relate the height of the building to the length of the shadow based on the angle of elevation.
  • Angle of Elevation – Understanding how the angle of elevation affects the relationship between the height of an object and the length of its shadow.
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